"And the next day, Daesh takes the next district in Afghanistan," he said referring to the Arabic name of the armed group.

"That proves to us that there is a hand in it and that hand can be no one else but them [the US] in Afghanistan."

GBU-43, the largest non-nuclear bomb, the US used in combat was dropped in the Achin district of Nangarhar province, close to the border with Pakistan, reportedly killing at least 36 ISIL fighters and destroying tunnel complex of the armed group.

The US Central Command (CENTCOM) said the attack was designed to minimise the risk to Afghan and US forces conducting clearing operations in the area.

The explosive, also known as the "mother of all bombs" (MOAB), was equal to 11 tonnes of TNT with a blast radius of 1.6km.

Witnesses said they felt the ground shake after the explosion, while others described towering flames in the aftermath.

At that time, Karzai also condemned the attack as "inhuman and most brutal misuse" of Afghanistan as "testing ground for new and dangerous weapons".

'Potential war crimes'

Karzai also said he welcomed a recent call by the International Criminal Court (ICC) prosecutor to investigate war crimes in Afghanistan, including those committed during his tenure in office.